The Crown Prosecution Service says the decision not to charge anyone in connection with the deaths of three soldiers after a training exercise in the Brecon Beacons was correct.
The Army reservists died after taking part in a training exercise on Pen y Fan in the Brecon Beacons in July 2013.
Lance Corporal Craig Roberts, 24, from Penrhyn Bay near Llandudno, Lance Corporal Edward Maher, 31, and Corporal James Dunsby, 31, from Bath, were taking part in a 40-mile hike in temperatures reaching 29C.
The families of two of the dead soldiers had campaigned a review of the case following the decision not to bring charges.
A CPS spokesperson said the families had been informed of the decision.